Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"vertical flow"”.
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Bioremediation of chlorinated ethanes and ethenes in vertical flow engineered wetland systems
… and ethenes contaminated groundwater using vertical flow engineered wetland systems were investigated in microcosm and column studies. Experiments on environmental and biogeochemical factors that affect system performance were conducted, and a numerical model involving advection, sorption, …
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A study of wall rewet and heat transfer in dispersed vertical flow.
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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SPH modeling of the vertical flow structure and turbulence in the swash
The vertical structure of swash-zone flows and turbulence, which is critical to sediment transport and flooding due to over-topping of dunes, will be examined using a Smoothed Particle Hydrodynamics model (DualSPHysics) evaluated with field observations obtained near La Jolla, CA in fall 2003. The …
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Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling
… mass flux, pressure, and inlet subcooling in a vertical rectangular channel that is heated from one side. CHF excursions are triggered under various system conditions and are compared with existing models. For the experimental conditions considered, the hydrophobic surface showed delayed onset …
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Development of a High Sensitivity, Multiplex Vertical Flow Immunoassay System for the Detection of Biothreat Agents
… goal of this project was to advance a promising vertical flow immunoassay (VFI) technology from laboratory concept toward a field-deployable prototype through a systematic methodology. The foundation of this effort began with establishment of the manufacturing process for the VFI’s core antibody …
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The vertical flow centrifugal gas-liquid separator and its application to the removal of gases from geothermal wells
Two vertical flow centrifugal gas-liquid separators were designed, built and tested using steam-water and air-water mixtures as the two-phase fluids. The theoretical analysis of the vertical flow centrifugal gas-liquid separator and the experimental data from the model separators is given in this …
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Application of data mining techniques to predict the performance of matured Vertical Flow Constructed Wetlands Systems treating urban wastewater
… to 28th March 2018 (thirty-nine months) of the vertical flow vertical wetlands system, receiving and treating domestic wastewater, were collected and utilised to assess and investigate the treatment performance efficiency of the Vertical Flow Constructed Wetland Systems (VFCWs) for removing …
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Azo textile dyes wastewater treatment with constructed wetlands : design and operation of experimental vertical-flow constructed wetlands applied for the treatment of azo textile dyes (with/without artificial wastewater)
… the mixture of both dyes on the performance of vertical-flow constructed wetlands in terms of dye reduction with/without artificial wastewater; (d) to determine the annual and seasonal reduction; and (e) to assess the influence of operational parameters such as contact time (48h and 84h), …
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Applications of Distributed Temperature Sensing in Subsurface Hydrology
… range of thermal dilution tests to groundwater flow. Thermal dilution tests undertaken at Ploemeur showed lithological contrasts, and allowed the apparent thermal conductivity to be estimated in-situ, but failed to detect previously identified transmissive fractures. The use of DTS to monitor …
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Measurements of condensation coefficient exhibited by water drops grown on rural cloud nuclei
… to final radius. The drops were grown in a vertical-flow thermal diffusion chamber, at supersaturations near 0.5 and 1.0%. The final drop sizes were large enough so that ß did not depend upon the size of the nucleus producing a given drop. The average value of ß was 0.025 with a standard …
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Urban wastewater treatment with mature constructed wetlands
… the global acceptance for the application of vertical-flow constructed wetlands (VF CWs) as sustainable and cost-efficient technology in treating various types of wastewater, including urban wastewater, continuous loading of wetlands over time can lead to performance inefficiency and generate …
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Velocity and temperature distributions for mercury in turbulent flow
… temperature profiles in mercury are reported for vertical flow in a pipe at Reynolds numbers of approximately 3.3 x 10⁴ and 5.4 x 10⁴ with variation in heat flux. At a Reynolds number ≈ 3.3 x 10⁴ profiles are reported for thermal calming lengths of approximately 17, 36, 61 and 84. The velocity …
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Treatment performance assessments of different wetland mesocosms
… with hydrocarbons, treatment performance of vertical-flow constructed wetlands can be hampered by clogging of the substrate media pores of the wetland filters. This clogging usually leads to blockage of filter substrate, progressive diminution of porosity and reduction of active pore volume, …
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THE EFFECTS OF WHOLE TREE HARVESTING ON SITE HYDROLOGY AND SOIL STRUCTURE AT BEDDGELERT FOREST, N. WALES, UK
… high conductivity. However, frequent macropore flow was not observed at the site. Tensiometer results showed that the mineral soil remained unsaturated. Therefore, a type of preferential flow dominates at both sites. A one dimensional modelling approach to soil water movement confirmed that …
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Characterisation of sedimentary structure and hydraulic behaviour within the unsaturated zone of the Triassic Sherwood Sandstone aquifer in North East England
… at a site near Selby in Yorkshire, creating a vertical and lateral profile of groundwater movement within the unsaturated zone. Moisture content has also been monitored using a neutron probe, and a commercially-available portable packer system, which have provided verification of the accuracy …
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Chemical Vapor Etching of Copper Using Oxygen and Various Beta-Diketones
A vertical-flow warm walled reactor was constructed to investigate the reactions of oxygen and beta-diketones on copper metal. The etch rate was studied as a function of time, temperature, grain orientation, oxygen partial pressure, beta-diketone, and beta-diketone partial pressure. Studies were …
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Dissolved air (pressure) flotation
… hydrostatic head of water in the saturator. A vertical flow type flotation unit was developed which provides a counter current flow regime and a stable interface between the clear liquid and rising agglomerates. The accumulated agglomerates discharge freely and without mechanical assistance at …
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Comparison of Biofilm Media in Reciprocating Biofilters Treating Dairy Flushwater
… (TN) removal than traditional subsurface flow wetland systems. The traditional substrate used to attach biomass was rock aggregate; this media may be hard to obtain for some agricultural projects, so alternate substrates are tested and compared with the rock aggregate. The purpose of the …
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Hot Mix Asphalt Permeability: Tester Size Effects and Anisotropy
… contents were used to observe how the ratio of vertical to horizontal permeability changes with air void content. The second goal was to develop a modified field permeameter to study the water-pavement contact area effect on field permeability. A reliable sealing system was created that is …
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